About how long do you all think it will take to install LT headers, a catback exhaust, with the xpipe...? I will be using ramps. I have never installed headers before, but I was figureing less than 5 or 6 hours for it all. Maybe less? Why do you all think, just trying to figure out how much time to anticipate.

I installed a set of headers on my GTO a while back and it took 8 hours. Just don't rush things, its not a race on how well you finish as long as its done right. A professional can probably get it done in 4 hours or less due to a lift which really helps.

I agree with the 6-8 hours. I did mine on jack stands and it took me 8 hours that included getting the car up, taking the old exhaust off, and installing Stainless Works headers and full exhaust all the way to the tips. Just take your time and enjoy the install these cars are alot easier to work on than the 4th gens.